In the second semi, Stanislav Donets (RUS) and Robert Hurley (AUS) tied in 23.14 after watching Guido Guilherme (BRA) go 23.57 in the first line-up. Other qualifiers: Sun, Orzechowski, Grevers, Baslakov, Delaney.

Men's 50m butterfly

Nicholas Santos set his second championship record of the day with a 22.23 blast into lane 4 for the final. The time is also a world textile best inside the 22.30 of Matt Targett (AUS), set this season. The first semi held what would turn out to be the 2nd to 5th best efforts going into the last 8, Thomas Shields (USA) at the helm on 22.58. Other qualifiers: Bousquet; Le Clos; Mankoc; Govorov; Verlinden; Wu.